Pressure tank cover construction



p 1952 B. R. WINBORN, JR.. ET AL 2,611,505

PRESSURE TANK COVER CONSTRUCTION Filed March 26, 1948 3 Sheets-Sheet l IN VEN TOR Zyron M92501 B gag, Wx

Milo/way Sept. 23, 19 B. R. WINBORN, JR, ET AL 2,611,505

PRESSURE TANK COVER CONSTRUCTION Filed March 26, 1948 3 Sheets-Sheet 2 Sept. 23, 1952 B. R. WINBORN, JR., ET AL PRESSURE TANK COVER CONSTRUCTION Filed March 26, 1948 3 Sheets-Sheet 5 I IN VEN TORS- Patented Sept. 23, 1952 Byron B. ,"Jr., and Daniel Beduhn,

- Manitowoc,.Wis., assignorsito ManitbwoclShip-j 'liuilding Company,'Manitowoc iwis;'

Application March 26, 1948,:Serial No.;1 '7',2ll'lv r prains; (0.2201 46) Thisv-jlnventflonarelates: toaxpressure tan spover v construction. t In pressure tanks suchv .assthe .filter-itanksrin dry cleaning equipment it hasbeen foundgdifiicnltto keen'the covert-tightly clampedltouthejtank Figures isI-an.enlargedscctionaidetail oflthe when'lpressurewasinternallyapplied. ;Ins a-ddistructure shown in Figure 1. tionto \thi'srthelcovers were very heavy andmere Figures 4 and {rare views corresponding-to Figclifflcu-lt vto position i. and .remove andewerealso. ure 3 showing modified forms of the invention. di-fficult to clamp in place against :the gasket. Figure 6 is 'a fra me y ectional ie Farther than-this. the aoperationlof qeltherlposie 10 thr u th v r sh w in Fi urefi showin hy tlcnlng. and-clamping.the cover or. loosening :the dimensions the amount of-curvatureof thevup clampsandremoving thelcovereconsumezl a;con-, Wardly dished cover. I Us H siderable amount of time .7 p I i Figure 7 is a force diagram for the structure. 'ThiS'jiIIVBHtl-OII is designed to overcomeythe shown in Figured p v, abovenoteddeiectsland objectsoi this invention Figures 8,9 and 10 are fragmentary vi w ew-vare to :providea cover which is .very' strong.- but, ing further forms of the invention. V V nevertheless which isoi light weight andnmay. be R ferringto. the drawings, Fi ur yl throu h}; quickly applied to or removed. from the tank, it will be seen that -a;-cylindrical pressure tank; andstnprovidelockingmeans.for thecoverrcoact- I h been illustrate u instance s the ing therewith'iin such, aman-nerthat the locking. filter tank in a; d y c in y em p This ,cymeans may .besubstantially instantly .applied' or. lind -t has a u erg a ;Zseeur dlthere removed, .thusallowing the light weight cover :to to and provided with an annulargroove; located be readily lifted from or positioned on the tank." internally of the tank and with a downwardly nlspeeifieobieet ofthis invention is to provide a d e h e 4- h e i 92m a. circular ;co.ver construction irriwhichthe cover. of. sheet metal a is p l ly dished and is isdished so that-on azsectiontfrom'the' center. relatively light, though very s Its-mar to theLperiphery oflthe coverxthe radius otcurvaginal ge D l' i DS a ez dedby turning; them. tare-graduallyincreasesvas themarginall edge oi inwa dly as in i ed a 6 and these rounded the ,;coverj:is approached. a i j portions constitute pressure transmitting por- "It-"has been :found that-with this-shaped ori which a engagement w h a locking dished cover, thatealthough a slight amount of resilient split ring lt Thesplit ring I is provided bowing occurs when-therpressureinside 'theltank with a ir f ward a d upwe d y te d ng iszraisedzthat the cover does not-blow off. It handle portions 8 end e f h a dl is;.therefore,.a further object of this invention to portions, 8 1501 instance, is located 619; qf' pmvideetenk coverwhichthoughof light weight J' one end o the r A d ls 0 mtbmw m V is provided'for the cover. a Further objects, for certainforms'of the in- I is noted that-the ho rs O 1 6, nation, are to so construct the cover and the. cotank is i downwardly H9 i m inal; operating-parts; that when the pressure builds up d o ii e n. annular l n a ke imthe'tank the major portion of the radial thrust 40 II is clamped, between hem sin l t e le tending to produce-a compressing force is not the cover and the l k ifl Of the-tank transmitted directly to .thatportlon' of the cover as shown t c e in F e 3- i sesesket subjected to maximum bending 'f'orces,:but' is s pa pp a lower s rezpert ens-alzs borne either by a reinforced portionor lava and I3, respectively, and these portions are 5'eparate, m'ember t lessening t e ';m ,xj num.- adapted to separate slightly when pressure-builds: flberzstressper'unit area for the portion of the up Within t e ta thus increasing the sea in cgv'er; adjacent ts periphery, efiect of the gasket against both the shoulder A furtherspeci iic object of thisinvention is to 4 0f the'ling and the ver 5- 1 '7 provide-'acover constructionfor a tankinwhich It i I b not lparticularlylfrom reference theilocking means is more-firmly forced intolockto Figure 3, that'the'. contacting portionsof :theins engagement iwith the collar of the 'itankas cover; 5 andllocking ring 1 are rounded and that pressureziszappliediintemally of the/tank, j the line of pressure is normal .to both surfaces Embodiments of the invention are 'shownin'the andextendsoutwardly and upwardly through the accompanying drawings. in which-4 I centerfoithelocking ring Thisthereiorepro-Y ;-Eig-ure v 1; is a. fragmentary "side elevation partly 1 m su f ta k w t h n e i place.

Figure jj 2 1 is plan view of the; structure in Figure 1.

du'ces a resultant force. which urges the ring :11:

outwardly into firmer engagement with the annular groove 3 of the tank as the pressure in the tank builds up. The cover will bow slightly under increasing pressure within the tank, but nevertheless it will still maintain the line of pressure between the locking ring 1 and the pressure transmitting rounded portion 6 of the cover along a line passing upwardly and outwardly through the locking ring i and thus the cover will not blow off.

Referring to Figure 4, it will be seen that the tank [4 is provided with an upper collar which has an annular groove l6 for the reception of an annular tubular gasket l8. The tubular gasket I8 is provided with one or more openings I 9 which places its interior in communication with the interior of the tank. The collar (5 is provided with an annular groove 26 which is arranged to receive the split resilientlocking ring 2! similar to the split ring 1 previously described. The cover 22 is upwardly dished and is provided with a rounded pressure transmitting portion 23 hearing against the ring 2!. The marginal portion 24 of the cover extends beyond the rounded portion 23 downwardly therefrom and bears against the gasket 18.

When pressure builds up within the tank the coaction between the rounded pressure transmitting portion 23 of thecover and the ring 21 is along a line upwardly and outwardly through the center of the ring, thus increasing the-security of engagement of the ring in the annular groove 20.

Referring to Figure 5, the tank 25 is provided with a collar 26 which has an annular groove 2'1 for the reception of an annular 'tubular gasket 28. The gasket 28 has one or more apertures 29 placing its interior in communication with the interior of the tank. The cover 30 is upwardly dished in a manner hereinafter to be described, and a continuous annular ring 3|, separate and distinct from the cover, is positioned'on top of the marginal portion 32 of the cover. The con tinuous ring 3| bears against the horizontal surface 3! of the marginal portion-32 of the cover. A resilient locking split ring 33,-similar tothe split ring I previously described, seats within an annular groove 34 formed internally of the collar 26 of the tank;

The line of pressure-between the rings 3| and;

33'passes through the center of the ring 33 and extends upwardly and outwardly, thus increasing the security of the locking of the ring 33 in the groove 34, r

The lower face of the marginal portion 32- of the cover has bonded to it a synthetic or other type of yielding annular gasket 38 which thus forms a permanent part of the cover-.- This gasket '38" protects the lower face of "the marginal portion 32 of the coverfrom becoming nicked or damaged during rough handling- The gasket 38 bears against the gasket 28 when the split ring 33 is in place.

-A section of the'dished cover 30 of Figure -5 is shown in Figure 6 with dimensions indicated by thereference character 35 showing the-amount of downward displacement of the dished cover from a horizontal line 36 passing tangent to the top center portion of the cover. These dimensions are not intended. as limiting but. are intended-to show a highly satisfactory design of coveuand to showlalso, for this. form of cover, how a gradual'increase in the tradius of curvature occurs fromthe center of thecover to the. marginal edge of the cover. In other words, the

cover curves more rapidly towards its marginal portion than it does toward its center portion.

Upon reference to the force diagram of Figure '7 a further advantage of the structure shown in Figure 5 will be observed. If the downwardly and inwardly directed force R, passing through the pressuretransmitting contacting portions of the rings 3|" and 33, is resolved into its horizontal component H and its downward component D, it will be seen that the radially inwardly directed thrust H is borne by the continuous ring 3| and only the downward thrust D is transmitted to the horizontal surface or pressure surface of the marginal lip 32 of the cover 30. In this way the cover is relieved of the radially inwardly directed compresslve force D and consequently the fiber stress per unit cross-sectional area of the cover is reduced. The surface 31 of the marginal flange 32 of the cover remains practically horizontal even when the cover is subjected to considerable internal pressure and therefore there is, for all practical purposes, substantially no radial thrust transmitted to the cover.

Referring to Figure 8 it will be seen-that thetank 39 is provided witha'collar 40 which has thegroove 4| for the resilient split locking rin "42- similar to the ring 1 previously described. The collar 40 also has a groove 43 which receivesithe annular gasket 44, such gasket being tubular and provided with one or more apertures 45. The cover 46 is provided with a thickened marginal portion 41 which has a synthetic, rubber'or'othe'r yielding gasket 48 bonded to .its under side. and

, which gasket is arranged to engage thegasket 44.

The cover is arranged to engage the split ring 42- and to bear upwardly against such split ring when. pressure exists Withinthe tank. It is to be noted that the thickened marginal portion :41-"con stitutes a reinforcing portion at the margin of the cover and consequently there is practically no deflectional stresses at this point and most of the compressive stresses are borne by this thickened Portion. a

Figure 9 shows a further form of the invention in which the tank 49 is provided with .acollar' 50 having a groove 5| for the reception of. the resile ient, split locking ring 52, similar to thering I previously described. The collar-also has "a groove 53 for the reception of an annular, tubular gasket 54 which may have one ormoreapertures 55 opening thereinto. Thecover 5-6 is providedwith: a rounded, lower marginal portion 5'! which-em: gages the gasket 53 and with an upturned, 3111111". The upturned, annular portion receives most of the compressive stresses while: the body lar .portion .58.

the deflectional stresses are borne in portion of the cover.

Figure 10 shows a further-form of the invention, the tank being indicated by the reference character 59 and the collarby the reference characterl 60. The collar 60 is provided with a groove .61; for thereception of asplit ring 62 similar'to the ring; .1 previously described.-. The collar :is alsoprovided with a groove li3forw the reception of the annular gasket 64, such gasket being providedwith one or more apertures.65,.- Thecover is. provided with a doubled portion or rounded; lower:

portion 61 which bears against the gasket 64 and with an'upturned, annular portion 68, which;.ene-:

gages the locking split ring .62. -Most:of the compressive stresses are borne in the portionttand most of the deflectional stresses are borne in-the' body ortion of the coverxBB.

In the form of the invention-shown in Figures' 8, 9, and 10, itwill'be seen that a" construction 01 cover has been provided in each instance in which the portion of the cover which bears the compressive stresses is so arranged that it does not have much of the deflectional stresses imposed thereon.

In the form of the invention shown in Figure 5 it will be seen that a separate and distinct continuous ring 3! independent of the cover is provided which bears the compressive stresses and that the cover is subjected almost entirely to deflectional stresses. In this way the stress per unit area in each form of the constructions shown in Figures 5, 8, 9, and is less per unit area and there is less chance of excessively straining the cover in these forms of the invention.

It will be seen from Figures 4, 5, 8, 9, and 10 that a shoulder All is provided against which the gasket is forced when the locking ring is in place and that this shoulder has an upwardly projecting portion 40" located inwardly of the gasket. The portion 40" is efiective to prevent the gasket from being forced radially inwardly even if a slight vacuum should be produced in the tank.

The covers forming the subject matter of this invention, though very strong, are nevertheless of light weight and can be easily lifted by the operator from the tank.

Further than this the locking rings may be easily placed in locking position or removed therefrom.

It will be seen that novel forms of cover constructions have been provided by this invention which are simple to make, economical to produce, of light weight, and may be readily handled and quickly and securely locked in place.

It will be seen further that although the covers forming the subject matter of this invention are of light weight, that they nevertheless will maintain a secure seal with the tank and will remain in place even though a considerable pressure is built up within the tank. 7

Although this invention has been described in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

We claim:

1. In a device of the class described, a cylindrical pressure tank having an open top and having an internally located annular groove adjacent its top edge, a circular cover for said tank, a continuous ring circular in cross-section located on the upper side of said cover adjacent the marginal edge of the cover, said tank having a shoulder, a gasket clamped between the marginal edge of said cover and said shoulder, and a split resilient locking ring wholly independent of said continuous ring and seated within said groove and engaging said first mentioned ring, the line of contact between the said rings extending through the center of both rings and outwardly at an angle to the axis of said tank, whereby internal pressure in said tank will increase the security of engagement of said locking ring within said groove.

2. In a device or the class described, a cylindrical pressure tank having an open top and having an internally located annular groove adjacent its top edge, a circular cover for said tank, a continuous ring circular in cross-section located on the upper side of said cover adjacent the marginal edge of the cover, said continuous ring being separate from said cover, said tank having a shoulder, a gasket clamped between the marginal edge of said cover and said shoulder, and a split resilient locking ring wholly independent of said continuous ring and seated within said groove and engaging said first mentioned ring, the line of contact between the said rings extending through the center of both rings and outwardly at an angle to the axis of said tank, whereby internal pressure in said tank will increase the security of engagement of said locking ring within said groove.

BYRON R. WINBORN, JR. DANIEL E. BEDUHN.

REFERENCES CITED The following references are of record in the.

file of this patent:

UNITED STATES PATENTS France -1 July 13, 1925' 

